Unfinished job

We started off well. My car had engine problem as previous mechanic failed and messed it up. SABELO NCUBE and Talent promised to repair the engine. The guys diagnosed, removed engine and did what they had to. Engine was starting, however engine mounts were not fastened as well as other parts. Mind you payments were made in full but engine still has leak between cylinder head and block. Gave him money for pump R2300, from August he hasn't bothed to fix my car and refund me. Over 5months now